<%# The license inside this block applies to this file.
	# Copyright 2017 Google Inc.
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	#     http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
-%>
func expand<%= prefix -%><%= titlelize_property(property) -%>(v interface{}, d TerraformResourceData, config *Config) (interface{}, error) {
  if v == nil || v.(string) == "" {
    return "", nil
  }
  f, err := <%= build_expand_resource_ref('v.(string)', property, pwd) %>
  if err != nil {
    return nil, fmt.Errorf("Invalid value for <%= property.name.underscore -%>: %s", err)
  }

  url, err := replaceVars(d, config, "{{ComputeBasePath}}"+f.RelativeLink())
  if err != nil {
    return nil, err
  }

  return url, nil
}
